From 5dea9da38d9e657c10de099bce68c12fc38a39dc Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Tue, 13 Dec 2022 03:37:06 +0100
Subject: [PATCH] build: Improve C99 compatibility of __progname configure
 check

The check uses printf, so it needs to include <stdio.h> for
compilers which do not support implicit function declarations.
(They were removed from C99.)

Closes: !23
Signed-off-by: Guillem Jover <guillem@hadrons.org>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index 3a1f19a..875ff04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,6 +241,7 @@ const char *p = program_invocation_short_name;
 AC_MSG_CHECKING([for __progname])
 AC_LINK_IFELSE([
   AC_LANG_PROGRAM([[
+#include <stdio.h>
 extern char *__progname;
   ]], [[
 printf("%s", __progname);